On Sun, Feb 17, 2008 at 07:09:42PM +0000, Ian Campbell wrote:
>
> On Fri, 2008-02-15 at 17:17 -0600, Matt Mackall wrote:
> > On Fri, 2008-02-15 at 15:21 -0600, Matt Mackall wrote:
> > > On Fri, 2008-02-15 at 21:32 +0100, Sam Ravnborg wrote:
> > > > On Fri, Feb 15, 2008 at 02:25:54PM -0600, Matt Mackall wrote:
> > > > > In 2.6.24 defconfig, my build stats show ioremap_32.o was 1.8k. In
> > > > > 2.6.25-rc1, the unified ioremap.o is 20.8k.
> > > >
> > > > Just an observation - 17 commits touches said file after
> > > > the unification (at least in latest -linus).
> > >
> > > Correction: those numbers should be halved. So we're going from .9k to
> > > 10.4k.
> >
> > And here's most of the cause:
> >
> > 000002b8 00000124 T early_ioremap
> > 00001000 00001000 t bm_pte
> > 00002000 00000004 T early_ioremap_debug
> >
> > static __initdata pte_t bm_pte[PAGE_SIZE/sizeof(pte_t)]
> > __attribute__((aligned(PAGE_SIZE)));
> >
> > Double ouch. First, this isn't in BSS. Second, even though it's
> > initdata, the alignment slop won't get recovered.
>
> 551889a6e2a24a9c06fd453ea03b57b7746ffdc0 (the reason you CC'd me) only
> changed this from unsigned long[1024] to pte_t[PAGE_SIZE/sizeof(pte_t)]
>
> -static __initdata unsigned long bm_pte[1024]
> +static __initdata pte_t bm_pte[PAGE_SIZE/sizeof(pte_t)]
> __attribute__((aligned(PAGE_SIZE)));
>
> I don't think that would have changed anything in this respect. It seems
> to have been that way since 0947b2f31ca1ea1211d3cde2dbd8fcec579ef395
> when it was added (Huang Ying CC'd).
>
> > Don't we have a special section for page-aligned crap so it doesn't
> > waste most of two pages?
>
> We have .bss.page_aligned and it seems appropriate to use it.
>
> Ian.
>
> ---
> From ac954372c1ed7830148bdea1e4283856c05c354f Mon Sep 17 00:00:00 2001
> From: Ian Campbell <[EMAIL PROTECTED]>
> Date: Sun, 17 Feb 2008 19:08:34 +0000
> Subject: [PATCH] x86: bm_pte can be placed in .bss.page_aligned.
>
> text data bss dec hex filename
> - 3388 8236 4 11628 2d6c
> ../build-32/arch/x86/mm/ioremap.o
> + 3388 48 4100 7536 1d70
> ../build-32/arch/x86/mm/ioremap.o
>
> Signed-off-by: Ian Campbell <[EMAIL PROTECTED]>
> Cc: Matt Mackall <[EMAIL PROTECTED]>
> Cc: Sam Ravnborg <[EMAIL PROTECTED]>
> Cc: Ingo Molnar <[EMAIL PROTECTED]>
> Cc: Huang Ying <[EMAIL PROTECTED]>
> ---
> arch/x86/mm/ioremap.c | 4 ++--
> 1 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
> index 69f4981..c62ecbd 100644
> --- a/arch/x86/mm/ioremap.c
> +++ b/arch/x86/mm/ioremap.c
> @@ -262,8 +262,8 @@ static int __init early_ioremap_debug_setup(char *str)
> early_param("early_ioremap_debug", early_ioremap_debug_setup);
>
> static __initdata int after_paging_init;
> -static __initdata pte_t bm_pte[PAGE_SIZE/sizeof(pte_t)]
> - __attribute__((aligned(PAGE_SIZE)));
> +static pte_t bm_pte[PAGE_SIZE/sizeof(pte_t)]
Replace
> + __attribute__((__section__(".bss.page_aligned")));
with the shorter form:
> + __section(.bss.page_aligned)));
Sam
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